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Peterson, 27, was almost eight months pregnant when she was reported missing Christmas Eve. Her body was badly decomposed when a passer-by found it in April at Point Isabel Regional Shoreline, south of Richmond. The body of her unborn son was found near the shoreline about a mile away.

Scott Peterson, 30, has been charged with two counts of murder in the deaths of his wife and son. Prosecutors are seeking the death penalty.

Prevailing winds and tides in the bay regularly bring debris ashore at Point Isabel, a park popular with dog walkers, officials said.